Functionally gradient metal matrix composites: Numerical analysis of the microstructure–strength relationships
Functionally gradient metal matrix composites: Numerical analysis of the microstructure–strength relationships
复制标题
DOI：
10.1016/j.compscitech.2005.09.003
复制
发表时间：
2006-09
影响因子：
9.1
通讯作者：
L. Mishnaevsky
中科院分区：
文献类型：
--
作者：
L. Mishnaevsky
通过对不同人工设计梯度组织的SiC颗粒增强Al基复合材料进行计算试验，研究了梯度组织对复合材料力学性能、强度和抗损伤性能的影响。在不同的梯度组织下，测定了不同颗粒排列、形状、尺寸和取向的复合材料在不同加载阶段的拉伸应力-应变曲线、失效颗粒率以及应力、应变和损伤分布。结果表明：随着颗粒排列梯度程度的增加，复合材料的流变应力和刚度减小，破坏应变增大；颗粒取向对细长或片状颗粒增强复合材料的破坏应变和损伤扩展有较大影响：水平取向颗粒确保最高破坏应变，垂直取向颗粒导致最低破坏应变，随机取向颗粒导致中等破坏应变。梯度复合材料中SiC颗粒的损伤生长始于颗粒，颗粒位于高颗粒密度区和无颗粒区之间的过渡区。
The effect of microstructures of graded SiC particle reinforced Al matrix composite on their mechanical behavior, strength and damage resistance was investigated on the basis of the computational testing of different artificially designed graded microstructures of the composites. The tensile stress–strain curves, fraction of failed particles, and stress, strain and damage distributions at different stages of loading were determined for different gradient microstructures of the composites, with varied particle arrangements, shapes, sizes and orientations. It was shown that flow stress and stiffness of composites decrease, and failure strain increases with increasing the degree of gradient of the particle arrangement. The orientations of particles have a strong impact on failure strain and damage growth in the composites reinforced with the elongated or plate-like particles: whereas the horizontally aligned particles ensure the highest failure strain, the vertically aligned particles lead to the lowest and the randomly oriented particles to the medium failure strain. The damage growth in the SiC particles in gradient composites begins in the particles, which are located in the transition zone between the zone of high particle density and the particle-free regions.